What is the roll-up hierarchy means?

Hello experts,
What is the roll-up hierarchy means?
I would greatly appreciate your help.
Thanks
Padma

The system arranges its own hierarchy of aggregates to speed up roll up and change run processing.  Essentially, some aggregates can be derived from other aggregates. Larger aggregates likely include numerous characteristics, while smaller ones fewer characteristics.  The smaller ones are very often "subsets" of the larger aggregates which are "supersets". 
When a roll-up is performed the "superset" aggregates are filled first from data in the InfoCube.  Next, "subset" aggregates are filled from data in the "superset" aggregates.  The system arranges this hierarchical relationship internally in order to optimize the performance of the rollup and change run.
Thanks for any points you choose to assign.
Regards -
Ron Silberstein
SAP

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